LibWeb: Store computed CSS value of background-repeat

Author: https://github.com/trflynn89
Commit: bd5a91269f
Pull-request: https://github.com/SerenityOS/serenity/pull/6083

Userland/Libraries/LibWeb/CSS/StyleValue.h

@@ -189,6 +189,15 @@ enum class Overflow : u8 {
     Visible,
 };
 
+enum class Repeat : u8 {
+    NoRepeat,
+    Repeat,
+    RepeatX,
+    RepeatY,
+    Round,
+    Space,
+};
+
 class StyleValue : public RefCounted<StyleValue> {
 public:
     virtual ~StyleValue();